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Reducing of Water Turbidity by Hydrotechnical Structures on the Example of the Wloclawek Reservoir

Szatten D. A., Babinski Z., Habel M.

Journal of Ecological Engineering

2018

Vol. 19, nr 3

197--205

The dynamics of river sediment transport reflects morphogenetic processes taking place in the catchment, being at the same time an anthropogenic indicator. The aim of the research is to determine the impact of hydrotechnical structures on the continuity of suspended sediments transport. The research area is the Lower Vistula River with a single dam – Wloclawek, operating since the 1970s. The research included direct measurements of water turbidity in 2013–2016 in characteristic cross-sections of the Vistula River, using commonly used methods. The LISST-25X laser grain composition measurement sensor was also used to collect data, enabling determination of grain size of the suspended sediments. However, on the selected section of the river, modelling of momentary transport of suspended sediments using GIS tools was carried out. There was a significant dynamics of sediments transport in the longitudinal profile of the river, in relation to the diversity of hydrological and morphological conditions of the Vistula River. The impact of Wloclawek Reservoir on water turbidity reduction was determined. The balance of transport of suspended material was related to the processes of erosion and sediment accumulation below the dam. The functioning of the Wloclawek Reservoir in the current system (as a single dam) has a significant impact on sediment transport, which directly determines the course of fluvial processes across the entire Lower Vistula (from km 675 to the estuary) and indirectly in the coastal zone of the Baltic Sea.

Przebieg procesu sedymentacji w czaszy zbiornika włocławskiego w latach 1970-2015

Mroziński J.

Gospodarka Wodna

2018

Nr 3

81--86

W artykule przedstawiono przebieg procesu sedymentacji zbiornika włocławskiego, opierając się na wynikach pomiarów batymetrycznych przeprowadzonych w latach 1970-2015. Analiza aktualnych i archiwalnych pomiarów wykazała dynamiczne zmiany w ukształtowaniu dna zbiornika, związane głównie z warunkami hydrologicznymi i geometrią koryta. Opisano zakres prowadzonych w tym okresie pomiarów oraz zmieniającą się metodykę prac batymetrycznych; wyliczono kubatury materiału osadzonego w czaszy zbiornika z jednoczesnym określeniem stref intensywnej sedymentacji. W podsumowaniu podano istotne wnioski i zalecenia wynikające z przeprowadzonej analizy sedymentacji zbiornika.

The article presents the course of the Włocławski Reservoir sedimentation process based on the results of bathymetric measurements carried out in the years 1970-2015. The analysis of the current and archival measurements indicated dynamic changes in the reservoir’s bottom topography, related mainly to the hydrological conditions and the reservoir bed’s geometry. The article describes the scope of the measurements carried out in that period and the changing methodology of the bathymetric works; it calculates the volume of the material set in the reservoir’s basin and determines the zones of intensive sedimentation. The summary contains important condusions and recommendations resulting from the reservoir's sedimentation analysis.